APA (7th ed.) Citation

Ryan, T. J. (2003). A paper that changed clinical practice. Blackwell Science Ltd.

Chicago Style (17th ed.) Citation

Ryan, T. J. A Paper That Changed Clinical Practice. Oxford, UK: Blackwell Science Ltd, 2003.

MLA (9th ed.) Citation

Ryan, T. J. A Paper That Changed Clinical Practice. Blackwell Science Ltd, 2003.